Atmospheric gas-burner.



No. 775,470. v RATRNTRD 10722, 190,4.

V P. GROSS. ATMOSPHERIC SAS BURNER.

Patented November 22, 1904.

PATENT OFFICE.

FRITZ GROSS, OF SOHNEBERG, GERMANY.

ATMOSPHEFHC GAS-BURNER.

SPECIFICATION forming part of Letters Patent N o. 77 5,470, dated November 22, 1904.

Application filed October 2, 1903.

To all whom it weary concern,.-

Be it known that I, FRITZ GRoss, engineer, a subject of the King of Prussia, German Emperor, and a resident of 13 Sedanstrasse, Schneberg, in the Kingdom of Prussia, German Empire, have invented certain new and useful Improvements in Atmospheric Gas- Burners, of which the following is an exact specification.

My invention relates to improvements in atmospheric gas-burners especially applicable for incandescent light, and more especially it relates to a device for preventing back lighting or flashing of the ame at the air-inlet.

The purpose of my invention is to provide such means for preventing the back flashing as do not offer any resistance to the gas and air passing through the burner.

The constructions hitherto used for preventing back flashing mostly consisted of flaps arranged in front of the gas-pipe, which aps were closed if no gas were supplied and were opened by the current of gas itself; but the great disadvantage was that these flaps offered a considerable resistance to the gas. Owing to this resistance it was impossible for a sufficient quantity of air to be carried alongv by the current of gas, as in case of a flap Which is large enough to allow a suficient quantity of gas and air to pass the relatively small quantity of gas impinging upon the Hap was mostly not suflicient for opening the flap far enough to allow the necessary quantity of air to be taken along by the gas. In order to do away with this disadvantage, a flap or non-return valve is employed which is open in the normal position, so that the same does not offer any resistance to the gas and air. If, however, there should be a draft back, the said valve closes.

In order to make my invention more clear, I refer to the accompanying drawings, in which- Figure 1 is a vertical section of my improved burner, and Fig. 2 is a section on line of Fig. 1.

It will be understood that the construction Vplates ofaluminium or the like.

Serial No. 175,483. (No model.)

shown on the drawings and described is only an example and that the invention may be modified in different ways.

In the drawings, c is the burner-cap fixed to the tube b. The latter is mounted on the pipe a, in the lower part of which the gasnozzle f is fixed.

g represents the air-admission holes. A valve is arranged within tli'e pipe a, which valve in the construction shown consists of two flaps CZ and each flap turns around a special spindle or shaft 6W. The iaps are advantageously made of very thin and light c represents counterweights fixed to the aps CZ, which counterweights tend to hold the iiaps in the position shown in full lines in the drawings.

It will be understood vthat instead of the counterweights springs or any other convenient means may be provided.

The burner works as follows: The gas flows through the nozzle f into the pipe a, in which it mixes with the air entering through the holes g, and the gas and air mixture fiows to the burner-cap c, where it is lighted. As soon as the flame begins to iiash back a pressure arises above the flaps 0l, by means of which pressure these flaps adopt the position shown in dotted lines in the drawings, thereby temporarily closing the pipe Cr and preventing the incoming gas being ignited at the nozzle f. By reason of the back flash quickly losing its force the flaps d will quickly be opened again on account of means being provided which tend to hold the same in the opened position, so that the mixture of gas and air can pass again to the burner proper.

It will be understood that the invention may be applied to any convenient construction of burners and may also be applied to burners burning downward.

Having thus fully described the nature of this invention, what I desire to secure by Letters Patent of the United States isl. In an atmospheric gas-burner 4the combination of the burner proper with flaps, situated in the burner-tube and adapted to close Weights for holding these flaps open, substantially as described and for the purpose set I0 forth.

In testimony whereof I have signed my name to this specih'cation in the presence of two subscribing Witnesses.

FRITZ GROSS. Titnessesz HENRY HAsPER, WOLDEMAR HAUPT. 

